Toyota Corolla Cross: Shut Down Signal Circuit
DESCRIPTION
The cause of the malfunction may be a shutdown signal.
Check whether there is a shutdown signal +B short circuit.
Related Parts Check|
Area | Inspection |
|---|---|
|
HSDN terminal | Check that the HSDN terminal voltage decreases to check for an open or short circuit while READY off (IG ON). |
|
Hybrid vehicle control ECU, inverter, wire harness |
Check for open or short circuit in hybrid vehicle control ECU, inverter and wire harness. |
SYSTEM DESCRIPTION
Power supply to the motor is cut off due to a shutdown signal sent from the hybrid vehicle control ECU to the motor generator control ECU (MG ECU).
WIRING DIAGRAM
Refer to the wiring diagram for the ECU Power Source Circuit.
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CAUTION / NOTICE / HINT
This diagnostic procedure is referenced to in the diagnostic procedure of several DTCs.
If the result of this diagnostic procedure is normal, proceed as directed in the procedure for the DTC.
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
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NOTICE:
- After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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- When disconnecting and reconnecting the auxiliary battery
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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PROCEDURE
|
1. | CHECK HYBRID VEHICLE CONTROL ECU |
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
|
*a | Component with harness connected (Hybrid Vehicle Control ECU) |
- | - |
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A192-9 (HSDN) - I249-1 (E1) |
Ignition switch ON |
Below 4.5 V |
(c) Turn the ignition switch off.
| OK | .gif) | SHUTDOWN SIGNAL CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC) |
|
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2. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the inverter with converter assembly connector.
(c) Disconnect the hybrid vehicle control ECU connectors.
(d) Connect the cable to the negative (-) auxiliary battery terminal.
(e) Turn the ignition switch to ON.
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A187-26 (HSDN) or A192-9 (HSDN) - Body ground |
Ignition switch ON |
Below 1 V |
NOTICE:
Turning the ignition switch to ON with the hybrid vehicle control ECU and inverter with converter assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(g) Turn the ignition switch off.
(h) Disconnect the cable from the negative (-) auxiliary battery terminal.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A187-26 (HSDN) - A187-1 (IGC1) |
Ignition switch off |
10 kΩ or higher |
|
A187-26 (HSDN) - A187-9 (IGC2) |
Ignition switch off |
10 kΩ or higher |
|
A192-9 (HSDN) - I249-8 (+B1) |
Ignition switch off |
10 kΩ or higher |
|
A192-9 (HSDN) - I249-10 (MREL) |
Ignition switch off |
10 kΩ or higher |
(j) Reconnect the hybrid vehicle control ECU connectors.
(k) Reconnect the inverter with converter assembly connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. | CHECK INVERTER WITH CONVERTER ASSEMBLY |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Disconnect the inverter with converter assembly connector.
| (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(d) Reconnect the inverter with converter assembly connector.
| OK | | REPLACE HYBRID VEHICLE CONTROL ECU |
| NG | | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
READ NEXT:
Inverter Low-voltage Circuit
DESCRIPTION The cause of the malfunction may be the low-voltage circuit.
Check whether there is an open circuit in the inverter +B low-voltage power source system or a problem in the communication
HV Battery High-voltage Line Circuit
DESCRIPTION The cause of the malfunction may be the HV battery high-voltage line circuit.
Check the continuity in the high-voltage line from the HV battery to the inverter.
Check the connection
Cooling System
DESCRIPTION The cause of the malfunction may be the cooling system.
Check whether the grille is blocked, whether coolant is leaking, the radiator fan operating condition and whether coolant has fro
SEE MORE:
Customer Problem Analysis Check
CUSTOMER PROBLEM ANALYSIS CHECK
HINT: Be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem, and then check for DTCs.
If the entry unlock function does not operate.
If the power source mode does not change
Removal
REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 FRONT FENDER MOULDING SUB-ASSEMBLY LH
75602A
- -
2 FRONT FENDER MOULDING SUB-ASSEMBLY RH
75601A
- -
3 FRONT BUMPER ASSEMBLY
